.leftiframe {
    width: 350px;
    height: 300px;
}

.rightiframe {
    width: 350px;
    height: 300px;
}

ul li {
    width: 300px;
    margin: 0 10px;
    list-style: none;
    float: left;
    text-align: center;
    margin: 0 auto;
}
a{
    text-decoration: none;
}

h3 {
    font-size: 28px;
    color: #00f;
    text-align: center;
}

.left-iframe-box {
    float: left;
}
.box{
    width: 700px;
   margin:0 auto;
}